We do not currently run antivirus software on the Macs and have not shared known infected files, but we were recently infected with a worm that is in the scbot family that only AVG from Grisoft has been able to detect. Macafee, Comp Assc., and Norton were not able to detect it, and still have no info on it. It attempted to log on as common users and locked out accounts in active directories, modified some registry enteries and started the winamp service several times. We update AV software daily. it is CA's InoculatIT. Our email runs through Message Labs, any Ideas on what it could be or how we were infested?